to what density/layer should I transmute it to in order to make things safe?

Quoting: A Coward 1427499

I'm afraid it's impossible

Seems Popo again preparing to start show! [link to www.cenapred.unam.mx] September 17 11:00 (September 17, 16:00 GMT)During the last 24 h, the monitoring system recorded 120 Popocatepetl exhalations of low and moderate intensity accompanied by emissions of steam, gas and sometimes small amounts of ash.